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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69738edfb3cdfc4d97b8b0d06dc8812feaad0e4cdfaa57c21b1fa686ea769dfd' 
  AND token = 'UQyUpMDFhMT6wkctec5D1SkfoWXla45Y+SFStDhC12k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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