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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f55fcf7ce53df9ba774fd895462f7a0c1d09ecc6fdd76d4bc408285f3387df6' 
  AND token = 'YL4O5TUb3+NETOWo7D1fCAOUS6lYpFcr5ulYYBN+mnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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