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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3e559e53bb9f8b63c99e5716be21e3c5074d465c41e0bb4641ff99be3af8c4' 
  AND token = 'HnjJd3XuM90ONDyb+DnIiuPIee8O1We2ZH/WWgigLCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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