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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5afb02a1046f3a81518c8e3e0fc32a4f5e117bdfe1e1e763b5d1efd4e6888f' 
  AND token = 'fnuhVrqo1i9RMj4dryD0VvnKGVzrzWpiHgogm4SKYxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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