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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c21d95c77f8c2968fe3f5db94e5617f9ca100d64efaaf369e6cde58aa9520d' 
  AND token = 'mdpe9zegxMnbggGbj+LfWNpFECPGU4Z+aP73QQUrKoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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