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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1648666a4fd8a5800fe65e6ada83ad3ae8fd5ea1555760ef4f48e7619f8bc4e' 
  AND token = 'LmpUHXnSbEnBQ0jHgJzv+B5ChEORVUE1Vn2em+7WOIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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