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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fff093e17b648ff57a28c0067789f0fc15dc07ea8aa53c69bf7fae3a230c54' 
  AND token = 'pF9MbqSoGi+pPCmRoew2xTs3weF42dZpg9fTyeZvDVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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