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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f320518b133bd057d9280e0ae14ddf0beca7f4433aff12e76ac880463179896' 
  AND token = 'R5f7io+0uv3psPBi0LYmb8w22u0l08g2byEOQGAlXEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}