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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800e3aeb660d87cb9f6b75ad8f05a071583013f47303c39bd5de970cf4187dd2' 
  AND token = 'N9iQONjGQUkXotb7tqR0WgZmFscDrnqjaTtCzsQKl1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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