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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0047f2a8662d3a089f8f0cecc69dc65c561590ad281bb16f3d95bfd32fc138' 
  AND token = '4l4jEwCoc5tTGjo9oslOni/QbVyUQH/6hnPH9Vminzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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