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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deefb44e1e78df8a20b473bd7a38cb2292d6f4a40cd8d132e472453c3b843a04' 
  AND token = 'S3Wq5Wt3EkVB12mx+X0IXlOla6kmuSbiJ5ww/tSP770=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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