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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d5810d9797d75f97b3b4cd0e28b35f78312095b3ccd816cb243f7facc85d03' 
  AND token = 'HPV/BEYlwU6/re1VEvdvq3M4tktqtbqQcG/bGsO+nUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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