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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2639d6577c020c00152e4ae635a95efb9610360721c3d9f5142d0355ac56df6' 
  AND token = 'cs2QaUBzW/vebimWxTV8ZNbOptYt+jkyo62pPJkcPTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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