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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac82b0cbd6d9d34afdca30f77c4a4cae37ac2ff4df9b8c10346aef181a1edc07' 
  AND token = 'bMTdkfOATwB66v5u3htKWWHwia8NozqBWV/rA8Wp4GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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