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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae7989d64f54328bd9a3b8fccf77ca2de3601681949ceea7976f4aeaa95a42d' 
  AND token = 'AG/klJj8e5QL47drCQYGZPwkIyEbyXZ09Fol4Pl9quI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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