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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9257f7370f09dfbc49651d1514a813aa5f0ffd935b0d613cea2c3e83bc87c78' 
  AND token = 'OhYF1l3ZojQV8HpgYFZ0EPX01IEWrrl5CUOjN3K3mZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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