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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28a98c3cd168cc83c9c5415510114482ee7f4041e8d6d88b3e26ac8e1ed84f6' 
  AND token = 'cKq1iEXuDiuqeRjWeXhJ9FcC/UWCcPQmCgHZkmh0/qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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