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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e55c000d3a7bbb366d96073bce38b0841733c5f6db223d80c69fdb7ba38229f' 
  AND token = 'xgpIo/0o8PttOnG9uOBVy94X/N+ySM4F7jv6AhPKjbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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