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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7bf2714d7695ccd078e9d4e2e608a6a9a51386586e1c760aaeef8496c32877' 
  AND token = 'xgDyrSq4tANr1e59xrCHIXQEIgvBDf6kc//wU099iI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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