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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557dbdd8540df87e4d872b350745be6a3325342fc00f05592c3aea12567fb4d7' 
  AND token = 'eylBgVUNPXY9MxAiTibd6+uiKaucFiaYZokcHeLVbRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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