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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87be5f23b74b40a2f54202bf25a61e5fea11c885721d1946b8a073171e268b84' 
  AND token = 'aNO+jD2XO581/jJJa/i/A89LlRk4ggMm7kOEBguMaUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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