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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd50ef3bd3af4d8dbb8bac085fa6818fcad44d424fae793f23b0c70f6d49e5f' 
  AND token = 'zOS7htnI0mjg8KxoO/dS7RSISzfCH+CE1wnTOiLyWmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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