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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c585ea06d5e8a6dc518e751db28d4521f119045b0ea5a993a6e2d294a2bbee13' 
  AND token = 'hd9KC92eeK62QO3UxJ4JUoR2zQBXQp7OawgJoq1a//s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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