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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d322794eb008da7a9414264bcf2fa1a179ce1b113b582e4b2f837bba308e80' 
  AND token = '6bcMhhjYp+qNjClA2hMR+HEY7h/5Jgx081ZQpFBRXtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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