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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37744ca6549620586ad5bcb5f55a355ed2d1140bbf9bcd8e972bcb36bf42a11' 
  AND token = 'h19pIX011z8IzFt9xfdcjG1dZBtT1aaQApCB4mtGLUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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