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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587aef579d293a0b1d02c341cd0561084b62cd4256637683dfd09c7a8136b9f3' 
  AND token = 'x39gusaxlJ419L3VcwHjxnedoIyi1nGo4PjvpG1w5mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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