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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a41883b12b7e6bcd213b2d5b8d9fd19b29e792938b3f6f9050278e9d3a2123' 
  AND token = '95IAVd9aCJ/U/M3Bm33TXxXgRLs5VUQTq262gu0InjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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