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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06946e5c8429b952ce72ca591c28a869e84da00955e9b8a75a9524ee30a44832' 
  AND token = 'BnJXn/R2uUUceCl844fcaUbScLaZNvas/oyRVT7Qsac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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