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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7862f1d6c33c173466d1c2323301b249d6550b4a4b144b40594a390a3c4e0381' 
  AND token = 'f9W6EqIBdyGpHtnpmky8XIORQZmOMK99mg8YFfZ2q/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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