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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b9ba62f52bfd8df936f076022a1565271d8c408221ba86ac20c8f216268428' 
  AND token = 'pPgRU9srLoAO630SjOQCVy6JyPMXY9J/BI8reOVQ9Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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