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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d03327b81b9d20c0c0d9291910066ac0665dc36e81dcd887c03a9f189f2317' 
  AND token = 'GAXqe74zLI4RrNGlUFNfH/czHWUK+pNRu9JZxU+Xs8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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