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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d58072948c441723787b9aad664d955bb2250e4449d7a3a86904b09636b6439' 
  AND token = 'Bg5KkDdcyrXc72noiMHPIIcHvYcOdJgL05Vk97VBIns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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