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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ca205619d87f01c5d1ec4552ea5354540e9383962105d1fe9280c4381a674c' 
  AND token = '1Irreei+stoNkopMeG0VwpLsRUDVYX1AhZg8iODR8Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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