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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961e11a29ac965ec63a8b0efa773905cb4785e00fc254342e41b3b170aa69d92' 
  AND token = 'ubE2Uv8XwAI8iZ7l5fAkLlZmhqaOV/IIMGl1yTtay+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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