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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11135d2f02e20e99c148c0cdc16b9650c6932735d91b0fd22f1cd04f15b24ca' 
  AND token = '9lB00g0n+SDCH7lqhGpIcaglV9FaeTcK7GX+E2suFi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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