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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f715d4db3dcfeeba42c13124ed0f7446f6793477fbb88f5c416ef3d542ea9edd' 
  AND token = 'tnRuxztyGp+IWvG1oJoWzKiqum2vp45wvm7NlgeuiFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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