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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd94322d84b4e89d3f8dc70d95ffff72c7626d55ef3fce633e97a55523590bd1' 
  AND token = 'WWRUXElynhJScjeYLLRqmTgJ/E1g5ZATawniqSwA5hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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