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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193bcd9861145413bb1569e727141cfb66c739e2a0a7856197f7fdb4cb3e3aa4' 
  AND token = 's7TlS5RNCuyyHrFFz8zqnHfcveQAp3ZynXbSVq6yf8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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