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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1a78e591a3ced33b912478a12a45f8b6cfcbe83f66029f0ac7f11af68055a0' 
  AND token = 'hU1FSNpHtDDUFlN02OIn1Q81RnrBidqw/YJkJGEPQRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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