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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ebef7f90a1329ca2330c1ba0bc64bf235edff051ced6b6c9a9e8bed29063d6' 
  AND token = 'y/YaZSowP9c2G087flJbtZt8oWDfLgJqAJzaNjuXEMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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