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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2589c1c656e4cc1a7b61a66bfd0022864026c2f900be03b44311092c35fdfb2' 
  AND token = 'h1tt9RGCeROk+1E3z84IsuUi5LI6QDRx5P8woFUSqaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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