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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0de4e9b62c517a83b5d1e6abfbe83c6c86b52922bb8b8b6459f0a558db0d64' 
  AND token = 'kYlcazhlBzHFyfT3dH57mgSKzuQzs19YEfX7VzWck1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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