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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8392104b0b9b77abc7609d929b20eb44aa3bd40238862ea6f80400b06092610b' 
  AND token = '6MG45fMbJnPLMP32Q2yWX5FsBmrjx0VlZnCxQeZg67A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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