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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6398f20f8342e74a780e1f03eb8579e894e05283d7d12f8fa120c55bbd40a241' 
  AND token = 'qaw86Pl8Knv9a/PWGfO10Ofwv/qnEA/J9R5vaO9cl6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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