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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4f176a0314d5436f7f6a32c18faabeb6166a38a1549fc7526b8adf9b1d93af' 
  AND token = 'Da4Gj+PVuqvbfI9PHjUNkjLrnoQB4M8t7W/NvyKrcQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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