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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f19acc2cc6ceaee6a28d9d396fa2f9b0a7dfb87118996dbde15926701e66dd1' 
  AND token = 't/kfPCdkuLgaXUPF6uK5f6fUT0R2pj6Pjy1hApLWRWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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