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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059f5c40d48a82dfe0d851a22fe51e1893ae9e99140201106d577203c7e9163f' 
  AND token = '6nbG6gIh5b9LkfqnaWJC+OP+OcPYovgCUXdvlkIHe9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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