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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0341c8762bda49990ef730e35847e57fdb641ded142f673b1be1c70d1a9dd8' 
  AND token = 'iddSj8esEXsJgKYt9nk4nYU+yIyVqAbOj53Rea8GUn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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