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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad24c1ff4f50efedba688f47f6a3d72bb27919b01ab51ef025c149c246ac884' 
  AND token = 'Y89DgismmOiz47wfw6lFOBX5yFHNQ4quF8FFBuDE2Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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