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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c09da4afba19bff0762d57753f689c45acf82e38d428d40892cc2b10f12aa28' 
  AND token = '9NW1CfAafQUVdU0n5wxxnaKnbc/I87RdBqmaxOWiQ+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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