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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b889e51ee801627ec56c2dab7e152e755596f4478693390f4967e57d9671c8' 
  AND token = 'gDBLvJ6j7JITJnrUNHUG3AvpwehsfGBIw21H3mQdh6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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