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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27550d1cd835b23d6a5fbd84a925300481f1626f9fc6e30272731a434af9f27' 
  AND token = '03GkGwje4ocuRDylNLmSxoX9+n4FZlnrjMIq3ERR+rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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