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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833d755eac28229e93949eab46edf5ef105ea66b137d6a73984d8891c25a13df' 
  AND token = '9exuOR391uRujxQ5oqKDWxfQms5ZaIK/aMXX8GS7S8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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