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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba06a3f5e7db99e75c1f9140e1b88adb952a3425424ef4d0495b187b04aa9ae' 
  AND token = 'tR3g5PtdAdH67UMKhSJitUiNI/dKH6GbPDHtG0CLxE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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