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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f70d68b02ae50295bd387128e677a16ea32eee0ab2967c752efddc92fc65b42' 
  AND token = 'bKWgZ93KeUWC1p79JjGY+2YkawW4kw8vnHgm6pSMfcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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