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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132e8e8ab93304cf86c7f6d54c37e345c4f52026e4ac8d5d11d2ce38a5ea9b9f' 
  AND token = '+fW4gJMBtDTxT0Xro8xe1lFS/FPdecS/7smpTfl9Hi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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