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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8cc98fd56ada71a250d6437f7899733b6abff1df8453ad6bd3af6c1cba30ea' 
  AND token = 'pgoXMYhtXgwI7A2gTJkbgVUl2Rz2WA8n8FhGLu4fzlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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