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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4877c1d2a93d891405899f8b423dc34222c362ca8a241c023d9ed1de7f1e1a1' 
  AND token = 'xzoql3BjFEQjLp00IpftnUakNMmgHH1jHGrTDBn/khw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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