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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a2699e414fb78ebccdd441bb739c537b3fdd6574efa17a35aa633af0174247' 
  AND token = 'XKsHev1Qn85CNjeRM+OuHK4Vgr5CoA4FE0d6wrXT8Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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