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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c8d2f8245635278bcdf43de817f2d95acb0c4aa7d991c67445bf93c5cb2de6' 
  AND token = '6HV3Upd9ZGobO/o4F4vhmTDrSAFDdl82/UDPzMloX3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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